[Info-vax] Rethinking DECNET ?

[Johnny Billquist]

On 2014-09-02 17:44, JF Mezei wrote:
> On 14-09-02 11:14, Bill Gunshannon wrote:
>
>> TCP/IP has never "pretended" to be anything OSI.  Some people have
>> tried to shoehorn it into the 7-layer Model
>
>
> The 7 layer model is not really specific to "OSI". It is a generic
> breakdown of networking functionality which was used in building the OSI
> networking stack, allowing each vendor to test compatibility of each layer.

No. The 7 layer model is specifically the OSI model. There is no 
universal rule that you have to have 7 layers, or what should be in each 
one of them. When we talk about the "7 layer model" we are explicitly 
talking about the OSI model.

The breaking down of a network stack in layers is another story. Pretty 
much any networking stack does that. That is generic. But exactly how is 
specific.

> The OSI networking stack included applications such as file transfer. So
> it rises to the top.
>
> The IP stack stops at the TCP layer, so it doesn't include applications
> such as FTP, SMTP, TELNET  etc.  So the IP stack stops at transport or
> session for TCP when viewed in certain ways.

Not sure why you want to exclude protocols like ftp from the TCP/IP stack.

> Because there are many subprotocols above IP (TCP, UDP, GRE, ICMP etc),
> the whole IP stack is more like a tree with many branches at the upper
> levels, some rising higher than others.

It's pretty much the same with any network stack.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol